/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Framework/PhysicsProxy.h
CONTEXT: PHYSICSTHREAD Called on the physics thread when the engine is shutting down the proxy and we need to remove it from any active simulations. Proxies are expected to entirely clean up their simulation state within this method. This is run in the task command step by the scene so the simulation will currently be idle
void OnRemoveFromScene()